build: Prepare for 0.13.91 release

diff --git a/NEWS b/NEWSindex 784747e..3f715d2 100644--- a/NEWS+++ b/NEWS@@ -1,3 +1,18 @@+Major Changes in 0.13.91:+=========================++*** IMPORTANT ***+0.13.91 is the first release candidate for the stable 0.14.x series. While some+bugs might still be present, it should be stable.++* set human-readable name on spice threads+* leak fixes+* robustness improvements (fix potential crashes in situation which should not+ happen on normal use)+* add sanity-checks for ORC library as it can abort spice-server when selinux+ is in use+* more code cleanups/improvements+ Major Changes in 0.13.90: =========================